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ES2015 & 2016 Features meta-issue #560

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samwgoldman opened this Issue Jun 24, 2015 · 48 comments

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samwgoldman commented Jun 24, 2015

Feel free to open an issue for any unchecked feature that doesn't already have one, but please try to keep discussion in a single issue if possible. Use cases (and test cases) are very welcome!

To report a bug with a completed feature, please open a new issue for the bug.

ES2015

  • let/const declarations (#784)
  • Regular expression u flag (#2510)
  • Regular expression y flag
  • Binary literals (#566)
  • New octal literals (#566)
  • Arrow functions
  • Default parameters (mostly supported, except using this: #1234)
  • Rest parameters
  • Spread operator
  • super references
  • Classes
  • for-of loops
  • Generators (#534)
  • Object literal property shorthand
  • Object literal method shorthand
  • Object literal computed properties (#252)
  • Template strings
  • Tagged templates
  • Tagged template fn strings param has a raw prop
  • Tagged template fn strings and raw arrays are frozen
  • Destructuring
  • Default values in destructuring (#183)
  • Unicode code point escapes
  • Allow duplicate object literal properties (except proto)
  • Modules
  • new.target (#1152)
  • Symbols (#810, #1015)
  • export Foo from 'foo' (#2403)

Non-standard proposals

  • async/await (stage 3)
  • object spread (stage 2)
  • async iterators (stage 3) (#1824)
  • class property initializers (stage 1) (#850)
  • class decorators (stage 1)
  • method decorators (stage 1)
  • function bind operator (stage 0) (#1545)
  • do expressions (stage 1) (#2523)
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mroch Jun 25, 2015

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this is super useful!

there are probably a bunch of new APIs that we need to add, too. for example, I just noticed that we don't have String.prototype.codePointAt (part of new unicode stuff)

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mroch commented Jun 25, 2015

this is super useful!

there are probably a bunch of new APIs that we need to add, too. for example, I just noticed that we don't have String.prototype.codePointAt (part of new unicode stuff)

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nmn Jun 29, 2015

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Perhaps, add an ES7 section and mark async-await as done.

(BTW, I find it surprising that async-await is done before generators!)

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nmn commented Jun 29, 2015

Perhaps, add an ES7 section and mark async-await as done.

(BTW, I find it surprising that async-await is done before generators!)

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Globegitter Jul 18, 2015

It seems there is an issue with ES6 Class support. I am using atom/nuclide IDE and having the following code:

export default class Resource {
  constructor(req:string) {
    this.req = req * 2;
  }
}

assignment of property req Property req not found in Resource even though I am defining it here in the constructor.

Globegitter commented Jul 18, 2015

It seems there is an issue with ES6 Class support. I am using atom/nuclide IDE and having the following code:

export default class Resource {
  constructor(req:string) {
    this.req = req * 2;
  }
}

assignment of property req Property req not found in Resource even though I am defining it here in the constructor.

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gabelevi Jul 19, 2015

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@Globegitter, Flow wants you to declare class properties like so:

export default class Resource {
  req: number;
  constructor(req: number) {
    this.req = req * 2;
  }
}

Why do we require this? Well, if we don't make people declare properties then we can't detect things like

function getReq(resource: Resource): number {
  return resource.rep;
}

We do realize this is a little bit more work for the developer, but we're hoping the benefits outweigh the pain.

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gabelevi commented Jul 19, 2015

@Globegitter, Flow wants you to declare class properties like so:

export default class Resource {
  req: number;
  constructor(req: number) {
    this.req = req * 2;
  }
}

Why do we require this? Well, if we don't make people declare properties then we can't detect things like

function getReq(resource: Resource): number {
  return resource.rep;
}

We do realize this is a little bit more work for the developer, but we're hoping the benefits outweigh the pain.

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Globegitter Jul 20, 2015

Aahh, I see, thanks @gabelevi For know I mostly want to use flow for its type inference with /* @flow weak */. The issue here is that I can not just put req; res; at the top, it does throw an 'Unexpected token;` issue.

Generally I do think this is an acceptable extra-effort, but why can flow not just get the information from the constructor itself? Is it that much more complex to see what this.req is assigned to and then look up the type in the constructor's parameter list?

As a side note kind of fitting to this, it would be great to see property initialiser support as mentioned here: http://babeljs.io/blog/2015/06/07/react-on-es6-plus/

Globegitter commented Jul 20, 2015

Aahh, I see, thanks @gabelevi For know I mostly want to use flow for its type inference with /* @flow weak */. The issue here is that I can not just put req; res; at the top, it does throw an 'Unexpected token;` issue.

Generally I do think this is an acceptable extra-effort, but why can flow not just get the information from the constructor itself? Is it that much more complex to see what this.req is assigned to and then look up the type in the constructor's parameter list?

As a side note kind of fitting to this, it would be great to see property initialiser support as mentioned here: http://babeljs.io/blog/2015/06/07/react-on-es6-plus/

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I think at the moment that Flow requires type annotations for the class member properties you declare. So

req: any; res: any;

should work. I did recently change the parsing of that (7e5b2a9) in preparation for class property initializers. We absolutely are planning support for class property initializers. They solve so many problems! The one I hate the most is how you have to do

class Foo {
  constructor() {
    this.myCallBack = this.myCallBack.bind(this);
  }
  myCallBack() { ... }
}

but with class property initializers you can do

class Foo {
  myCallBack = () => { ... }
}
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gabelevi commented Jul 20, 2015

I think at the moment that Flow requires type annotations for the class member properties you declare. So

req: any; res: any;

should work. I did recently change the parsing of that (7e5b2a9) in preparation for class property initializers. We absolutely are planning support for class property initializers. They solve so many problems! The one I hate the most is how you have to do

class Foo {
  constructor() {
    this.myCallBack = this.myCallBack.bind(this);
  }
  myCallBack() { ... }
}

but with class property initializers you can do

class Foo {
  myCallBack = () => { ... }
}
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Globegitter Jul 20, 2015

Thanks for the quick response that all sounds good :) And yep it really does solve a lot of issues.

Globegitter commented Jul 20, 2015

Thanks for the quick response that all sounds good :) And yep it really does solve a lot of issues.

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samwgoldman Jul 20, 2015

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Generally I do think this is an acceptable extra-effort, but why can flow not just get the information from the constructor itself? Is it that much more complex to see what this.req is assigned to and then look up the type in the constructor's parameter list?

@Globegitter, good insight! Actually, flow used to do this, but the functionality was removed. I'm not sure about the details surrounding this, but there is some explanation in a comment in the source code.

Unfortunately, this change was from the days of "sync to upstream" so the diff is big and it's hard to see the implications in terms of the code changes themselves.

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samwgoldman commented Jul 20, 2015

Generally I do think this is an acceptable extra-effort, but why can flow not just get the information from the constructor itself? Is it that much more complex to see what this.req is assigned to and then look up the type in the constructor's parameter list?

@Globegitter, good insight! Actually, flow used to do this, but the functionality was removed. I'm not sure about the details surrounding this, but there is some explanation in a comment in the source code.

Unfortunately, this change was from the days of "sync to upstream" so the diff is big and it's hard to see the implications in terms of the code changes themselves.

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oztune Jul 28, 2015

image

^ What happened with let support?

I think it'd help if this was taken care of if only because at a glance it makes the whole project seem to be behind. For example it's being used as a con on this list, which happens to be a top result for googling "flow vs TypeScript"

image
http://www.reddit.com/r/javascript/comments/39cere/typescript_vs_flow_results_from_our_investigation/

Also in this comment:
image
http://www.reddit.com/r/javascript/comments/39cere/typescript_vs_flow_results_from_our_investigation/ct6xagb

Flow looks really promising, keep up the great work!

oztune commented Jul 28, 2015

image

^ What happened with let support?

I think it'd help if this was taken care of if only because at a glance it makes the whole project seem to be behind. For example it's being used as a con on this list, which happens to be a top result for googling "flow vs TypeScript"

image
http://www.reddit.com/r/javascript/comments/39cere/typescript_vs_flow_results_from_our_investigation/

Also in this comment:
image
http://www.reddit.com/r/javascript/comments/39cere/typescript_vs_flow_results_from_our_investigation/ct6xagb

Flow looks really promising, keep up the great work!

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samwgoldman Jul 28, 2015

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What happened with let support?

We're actively working on it. Please be patient.

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samwgoldman commented Jul 28, 2015

What happened with let support?

We're actively working on it. Please be patient.

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@oztune by all means use my fork in the mean time: github.com/nmn/flow

  • Up to date with flow itself
  • Let/const support added by making flow treat them like var. (if you use Babel, the block scoping and const checking is already done for you)
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nmn commented Jul 28, 2015

@oztune by all means use my fork in the mean time: github.com/nmn/flow

  • Up to date with flow itself
  • Let/const support added by making flow treat them like var. (if you use Babel, the block scoping and const checking is already done for you)
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gregwebs Aug 29, 2015

classes are checked, but class property initializers are not supported: can we have a check box for that? Making it hard for me to swallow ES6 classes right now.

An alternative approach to much of this work is to leverage babel more

gregwebs commented Aug 29, 2015

classes are checked, but class property initializers are not supported: can we have a check box for that? Making it hard for me to swallow ES6 classes right now.

An alternative approach to much of this work is to leverage babel more

@samwgoldman samwgoldman changed the title from ES6 Features meta-issue to ES2015 Features meta-issue Aug 29, 2015

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@gregwebs class property initializers are not ES6/ES2015, but it's definitely on our radar. I think, instead of creating a separate meta issue for ES2016 features, we should just track that here. I'll make the necessary changes.

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samwgoldman commented Aug 29, 2015

@gregwebs class property initializers are not ES6/ES2015, but it's definitely on our radar. I think, instead of creating a separate meta issue for ES2016 features, we should just track that here. I'll make the necessary changes.

@samwgoldman samwgoldman changed the title from ES2015 Features meta-issue to ES2015 & 2016 Features meta-issue Aug 29, 2015

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gregwebs Aug 30, 2015

Ah, in that case I will take any hack I can get. Seems to work to put this in the constructor:

      // fix broken es6 classes
      _.each(Object.getOwnPropertyNames( Object.getPrototypeOf(this) ), prop => {
        this[prop] = this[prop].bind(this)
      })

gregwebs commented Aug 30, 2015

Ah, in that case I will take any hack I can get. Seems to work to put this in the constructor:

      // fix broken es6 classes
      _.each(Object.getOwnPropertyNames( Object.getPrototypeOf(this) ), prop => {
        this[prop] = this[prop].bind(this)
      })
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@samwgoldman I think it would make sense to update #431 to #784 given that's where the ongoing work is now.

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Gozala commented Sep 11, 2015

@samwgoldman I think it would make sense to update #431 to #784 given that's where the ongoing work is now.

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@Gozala You're right! Thanks & done.

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samwgoldman commented Sep 11, 2015

@Gozala You're right! Thanks & done.

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I'd vote for adding export extensions to the ES2016 list. (Not sure if they're supported?)

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cesarandreu commented Sep 11, 2015

I'd vote for adding export extensions to the ES2016 list. (Not sure if they're supported?)

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Is there an maintained list of the various proposals, along with the stage? Official would be ideal, but anything would help.

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samwgoldman commented Sep 11, 2015

Is there an maintained list of the various proposals, along with the stage? Official would be ideal, but anything would help.

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@samwgoldman there's a list of the ones that are available in babel.

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cesarandreu commented Sep 11, 2015

@samwgoldman there's a list of the ones that are available in babel.

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BenoitZugmeyer commented Sep 12, 2015

@samwgoldman Here is the official list: https://github.com/tc39/ecma262

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@samwgoldman I thinks the Reflect should be added to the list of ES2015

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tsing commented Sep 17, 2015

@samwgoldman I thinks the Reflect should be added to the list of ES2015

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I think #810 should be on the list as well

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Gozala commented Sep 17, 2015

I think #810 should be on the list as well

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@samwgoldman I just filed #850 for ES7 property initializers, so could you please update this issue with that?

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bolinfest commented Sep 23, 2015

@samwgoldman I just filed #850 for ES7 property initializers, so could you please update this issue with that?

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RavenHursT Oct 15, 2015

What about ES6 Getters and Setters? Currently Flow doesn't support the syntax, correct?

http://javascriptplayground.com/blog/2013/12/es5-getters-setters/

RavenHursT commented Oct 15, 2015

What about ES6 Getters and Setters? Currently Flow doesn't support the syntax, correct?

http://javascriptplayground.com/blog/2013/12/es5-getters-setters/

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@RavenHursT you can add unsafe.enable_getters_and_setters=true under [options] in your flowconfig

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hzoo commented Oct 16, 2015

@RavenHursT you can add unsafe.enable_getters_and_setters=true under [options] in your flowconfig

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RavenHursT Oct 16, 2015

@hzoo so looks like back in 0.14 they added what you're suggesting.. what does the unsafe denote? Is this something we can use now in 0.16 and it'll work?

https://github.com/facebook/flow/releases/tag/v0.14.0

RavenHursT commented Oct 16, 2015

@hzoo so looks like back in 0.14 they added what you're suggesting.. what does the unsafe denote? Is this something we can use now in 0.16 and it'll work?

https://github.com/facebook/flow/releases/tag/v0.14.0

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@RavenHursT It's unsafe because a setter/getter might have a side-effect that causes a program to have a runtime error, but Flow won't catch it.

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samwgoldman commented Oct 16, 2015

@RavenHursT It's unsafe because a setter/getter might have a side-effect that causes a program to have a runtime error, but Flow won't catch it.

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RavenHursT Oct 21, 2015

@samwgoldman Got it. Thanks! 👍

RavenHursT commented Oct 21, 2015

@samwgoldman Got it. Thanks! 👍

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@samwgoldman Could you add ES7 function bind syntax to the list ?
It is useful when use React ES6 classes

https://github.com/zenparsing/es-function-bind

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tsing commented Oct 21, 2015

@samwgoldman Could you add ES7 function bind syntax to the list ?
It is useful when use React ES6 classes

https://github.com/zenparsing/es-function-bind

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@tsing I'm not sure we should even track stage 0 (strawman) proposals. I'd like to see that proposal make a bit more standardization progress first.

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samwgoldman commented Oct 23, 2015

@tsing I'm not sure we should even track stage 0 (strawman) proposals. I'd like to see that proposal make a bit more standardization progress first.

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Is there already an issue for documentation somewhere? I don't know if it's supposed to be yet, but how to annotate arrow functions doesn't seem to be documented in http://flowtype.org/docs/functions.html.

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jrajav commented Feb 24, 2016

Is there already an issue for documentation somewhere? I don't know if it's supposed to be yet, but how to annotate arrow functions doesn't seem to be documented in http://flowtype.org/docs/functions.html.

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List is outdated:
Class Decorator are fixed with #1638
Regexp u and y flags with #1177

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marudor commented Apr 17, 2016

List is outdated:
Class Decorator are fixed with #1638
Regexp u and y flags with #1177

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willclarktech Apr 26, 2016

+1 for function bind operator

willclarktech commented Apr 26, 2016

+1 for function bind operator

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anaibol commented Jun 5, 2016

+1!

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rosskevin Jun 9, 2016

ES2015/2016 classes without semicolons break the parser and provide incorrect errors. See #1908 with test repo included.

rosskevin commented Jun 9, 2016

ES2015/2016 classes without semicolons break the parser and provide incorrect errors. See #1908 with test repo included.

jrajav added a commit to jrajav/flow that referenced this issue Jul 12, 2016

ghost pushed a commit that referenced this issue Jul 18, 2016

Update 01-functions.md with ES2015 function features [Ref #560]
Summary:
Add information about annotating ES2015 default values and arrow functions (based on current behavior) to the Functions docs.
Closes #2075

Reviewed By: bhosmer

Differential Revision: D3572098

Pulled By: avikchaudhuri

fbshipit-source-id: 241341efed5a4fcc72e8ddb741ec8e67793452a5
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rpominov Sep 17, 2016

Couldn't find class literal properties in the list. For example:

class Id<T> {
  _x: T;
  constructor(x: T) {
    this._x = x
  }
  static 'fantasy-land/of'<T>(x: T): Id<T> {
    return new Id(x)
  }
}

Flow yields:

static 'fantasy-land/of'<T>(x: T): Id<T> {
       ^ literal properties not yet supported

Is this on agenda? We need this for Fantasy Land.

rpominov commented Sep 17, 2016

Couldn't find class literal properties in the list. For example:

class Id<T> {
  _x: T;
  constructor(x: T) {
    this._x = x
  }
  static 'fantasy-land/of'<T>(x: T): Id<T> {
    return new Id(x)
  }
}

Flow yields:

static 'fantasy-land/of'<T>(x: T): Id<T> {
       ^ literal properties not yet supported

Is this on agenda? We need this for Fantasy Land.

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yamafaktory Feb 21, 2017

Hi,

The class decorators feature is marked as checked but currently, those decorators are still not present in the AST (#1638 & #2741).

And thanks a lot for your great work 👍.

yamafaktory commented Feb 21, 2017

Hi,

The class decorators feature is marked as checked but currently, those decorators are still not present in the AST (#1638 & #2741).

And thanks a lot for your great work 👍.

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DimitryDushkin May 15, 2017

export default from './some-component';

throws "Unexpected string" error.

Issue is resolved via some "hack":

export { default } from './some-component';

DimitryDushkin commented May 15, 2017

export default from './some-component';

throws "Unexpected string" error.

Issue is resolved via some "hack":

export { default } from './some-component';
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Kovensky May 15, 2017

That is not some hack, that is the correct syntax (reexport the "default" export as an export named "default"). export default from is not valid syntax, but maybe the error message could be better.

Kovensky commented May 15, 2017

That is not some hack, that is the correct syntax (reexport the "default" export as an export named "default"). export default from is not valid syntax, but maybe the error message could be better.

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Pauan May 15, 2017

There is a proposal to add in this feature: [link]

And a related proposal: [link]

Pauan commented May 15, 2017

There is a proposal to add in this feature: [link]

And a related proposal: [link]

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DimitryDushkin May 15, 2017

Thank you. I thought it's already in specification, because webpack 2 understands export default from ....

DimitryDushkin commented May 15, 2017

Thank you. I thought it's already in specification, because webpack 2 understands export default from ....

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langri-sha May 16, 2017

do expressions are now stage 0. Here's is the list of active ECMAScript proposals for the curious.

langri-sha commented May 16, 2017

do expressions are now stage 0. Here's is the list of active ECMAScript proposals for the curious.

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lyleunderwood Nov 29, 2017

do expressions are now stage 1.

lyleunderwood commented Nov 29, 2017

do expressions are now stage 1.

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leoselig Jan 3, 2018

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@samwgoldman I believe this

  • Default parameters (mostly supported, except using this: #1234)

is already done as of d3887c2.

Is this list still maintained?

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leoselig commented Jan 3, 2018

@samwgoldman I believe this

  • Default parameters (mostly supported, except using this: #1234)

is already done as of d3887c2.

Is this list still maintained?

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grundiss May 31, 2018

Still no support for do-expressions? :C

grundiss commented May 31, 2018

Still no support for do-expressions? :C

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PinkaminaDianePie Jun 2, 2018

Any news about do-expressions? They are extremely useful for FP-style, but I can't use flow together with them.

PinkaminaDianePie commented Jun 2, 2018

Any news about do-expressions? They are extremely useful for FP-style, but I can't use flow together with them.

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verekia Jul 17, 2018

Throw expressions: #6605

verekia commented Jul 17, 2018

Throw expressions: #6605

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bradennapier Jul 20, 2018

do expressions ftw!

bradennapier commented Jul 20, 2018

do expressions ftw!

@yuchi yuchi referenced this issue Jul 21, 2018

Open

Tooling implementation status #27

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